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Numéro de publicationUS7373644 B2
Type de publicationOctroi
Numéro de demandeUS 09/969,437
Date de publication13 mai 2008
Date de dépôt2 oct. 2001
Date de priorité2 oct. 2001
État de paiement des fraisPayé
Autre référence de publicationUS9338227, US20030065703, US20080162700, US20160255145
Numéro de publication09969437, 969437, US 7373644 B2, US 7373644B2, US-B2-7373644, US7373644 B2, US7373644B2
InventeursJustin Aborn
Cessionnaire d'origineLevel 3 Communications, Llc
Exporter la citationBiBTeX, EndNote, RefMan
Liens externes: USPTO, Cession USPTO, Espacenet
Automated server replication
US 7373644 B2
Résumé
Methods and apparatus for detecting a change in demand for server resources across a load-bearing system having one or more content servers hosting identical content, the load-bearing system being connected to a network of content servers; and automatically modifying the number of content servers on the load-bearing system in response to the change in demand.
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Revendications(31)
1. A computer implemented method comprising:
detecting a change in demand for server resources across a load-bearing system having a number of content servers hosting identical content, the load-bearing system being connected to a network of content servers, wherein the network comprises at least one other load-bearing system having one or more content servers each assigned a priority level; and
automatically modifying the number of content servers on the load-bearing system in response to the change in demand, wherein automatically modifying the number of content servers on the load-bearing system comprises:
selecting an available content server from a selected one of the at least one other load-bearing system based on a comparison of the priority level assigned to the available content server relative to at least one other content server in the network;
loading identical content onto the selected content server by an image manager in communication with the selected content server;
adding the selected content server to the load-bearing system, wherein all of the content servers on the load-bearing system including the selected content server use the identical hosted content;
detecting a change in demand greater than a pre-configured threshold; and
adding a content server to the load-bearing system if the number of content servers on the load-bearing system is less than a maximum number assigned to the hosted identical content,
wherein the hosted identical content is assigned a priority level of a plurality of priority levels, and wherein selecting an available content server comprises selecting an available content server having a lowest priority level and a highest available load capacity.
2. The method of claim 1, wherein each content server on the network is categorized as active or idle.
3. The method of claim 1, wherein the hosted identical content is assigned a number defining a maximum number of content sewers on the load-bearing system.
4. The method of claim 1, wherein the available content server having a least number of active sessions of the number of content servers is selected.
5. The method of claim 1, wherein the hosted identical content is assigned a number defining a minimum number of content servers on the load-bearing system.
6. The method of claim 1, further comprising:
detecting a negative change in demand greater than a pre-configured threshold; and
removing a content server from the load-bearing system if the number of content servers on the load-bearing system is greater than a minimum number assigned to the hosted identical content.
7. The method of claim 6, wherein removing comprises removing the content server having a highest available load capacity.
8. The method of claim 6, wherein removing comprises removing the content server having a least number of active sessions.
9. A system comprising:
a first network having client servers connected to an Internet;
a second network connected to the Internet, the second network comprising:
content servers connected to a management server, a first subset of the content servers providing a load bearing system, the management server including a means for detecting a change in demand for content server resources across the load-bearing system; and
means for automatically modifying a number of content servers in the first subset of content servers on the load bearing system in response to the change in demand, wherein automatically modifying the number of content servers on the load-bearing system comprises:
selecting an available content server on the Internet;
loading identical content from a management server onto the selected content server by an image manager in communication with the selected content server;
adding the selected content server to the load-bearing system, wherein all of the content servers on the load-bearing system including the selected content server use the identical hosted contents;
detecting a change in demand greater than a pre-configured threshold; and
adding a content server to the load-bearing system if the number of content servers on the load-bearing system is less than a maximum number assigned to the identical hosted content,
wherein the identical hosted content is assigned a priority level of a plurality of priority levels, and wherein selecting an available content server comprises selecting an available content server having a lowest priority level and a highest available load capacity.
10. The system of claim 9, wherein the first subset of content servers uses an identical hosted content.
11. The system of claim 9, wherein the management server includes a means for categorizing each content server as active or idle.
12. The system of claim 9, wherein the management server includes a means for assigning the priority level of the plurality of priority levels to the hosted content.
13. The system of claim 9, wherein the management server includes a means for assigning a number defining the maximum number of content servers on the load-bearing system to the identical hosted content.
14. The system of claim 9, wherein the management server selects the available content server having a least number of active sessions.
15. The system of claim 9, wherein the management server includes a means for assigning a number defining a minimum number of content servers on the load-bearing system to the identical hosted content.
16. The system, of claim 9, wherein the management system further comprises a means for:
detecting a negative change in demand greater than another pre-configured threshold; and
removing a content server from the load-bearing system if the number of content servers on the load-bearing system is greater than a minimum number assigned to the hosted content.
17. The system of claim 16, wherein the management server removes the content server having a highest available load capacity.
18. The system of claim 16, wherein the management server removes the content server having a least number of active sessions.
19. A system comprising:
a network comprising a plurality of content servers,
a plurality of load-bearing systems, wherein each of the load-bearing systems comprises one or more of the plurality of content servers; and
a management server configured to:
identify a load-bearing system with insufficient load capacity,
identify an available content server from one or more idle servers not already allocated to any of the load-bearing systems,
allocate the identified content server to the load-bearing system with insufficient capacity,
cause content to be copied onto the identified content server, wherein the content is identical to content associated with the load-bearing system with insufficient capacity,
detect a change in demand greater than a pre-configured threshold; and
add a content server to the load-bearing system if the number of content servers on the load-bearing system is less than a maximum number assigned to the hosted identical content,
wherein the identical content is assigned a priority level of a plurality of priority levels, and wherein identifying an available content server comprises identifying an available content server having a lowest priority level and a highest available load capacity.
20. The system of claim 19, wherein the management server is further configured to identify an available content server from a plurality of idle content servers already allocated to one of the other load-bearing systems by analyzing priority levels assigned to the plurality of idle content servers.
21. The system of claim 19, wherein each of the plurality of load-bearing systems distributes incoming content requests to associated servers based on a load scheme selected from a group consisting of a load-bearing scheme, a load-balancing scheme, and a load-leveling scheme.
22. The system of claim 19, wherein a notification is sent to a network operator maintaining the network if no content servers are available to be associated with the load-bearing system with insufficient capacity.
23. The system of claim 20, wherein the management server is further configured to identify an available content server allocated with one of the other load-bearing systems by polling each of the plurality of content servers to determine which content server has the highest available load capacity.
24. The system of claim 20, wherein the management server is further configured to identify an available content server associated with one of the other load-bearing systems by polling each of the plurality of content servers to determine which content server has the least number of running processes.
25. The system of claim 19, wherein each of the plurality of load-bearing systems is assigned a minimum number of content servers.
26. The system of claim 25, wherein the minimum number of content servers is assigned based on a priority level of the load-bearing system.
27. The system of claim 19, further comprising an image manager configured to de-allocate a content server from one of the load-bearing systems if the historical demand for service warrants de-allocation of a content server.
28. A method for allocating a number of servers to a plurality of web sites, the method comprising:
allocating one or more servers to each of a plurality of web sites;
for each web site, loading a file having content for implementing the web site onto the one or more servers allocated to the web site;
assigning a priority to each file;
monitoring load capacity on the one or more servers allocated to each web site;
detecting load at the one or more servers allocated to a web site that is greater than a specified threshold;
identifying a server allocated to one of the other web sites that is available to be re-allocated to the web site for which load is detected to be greater than the specified threshold, wherein identifying the server to be re-allocated comprises:
determining whether the file of a server allocated to another of the web sites is assigned a lower priority than the priority assigned to the file loaded on the one or more serves for which load is detected to be greater than the specified threshold; and
determining whether the number of servers allocated to the other web site is greater than a specified minimum number of servers;
if the file of the identified server has a lower priority and the number of servers allocated to the other web site is greater than the specified minimum number of servers, re-allocating the identified server from the web site to the web site for which load is detected to be greater than the specified threshold, wherein re-allocating the identified server comprises:
stopping directing of client requests to the identified server;
loading the file implementing the web site for which load is detected to be greater than the specified threshold onto the identified server; and
changing an Internet protocol address of the identified server to an IP address corresponding to the web site that the identified server is re-allocated to.
29. A computer implemented method comprising:
detecting a change in demand for server resources across a load-bearing system having a number of content servers hosting identical content, the load-bearing system being connected to a network of content servers, wherein the network comprises at least one other load-bearing system having one or more content servers each assigned a priority level; and
automatically modifying the number of content servers on the load-bearing system in response to the change in demand, wherein automatically modifying the number of content servers on the load-bearing system comprises:
selecting an available content server from a selected one of the at least one other load-bearing system based on a comparison of the priority level assigned to the available content server relative to at least one other content server in the network;
loading identical content onto the selected content server by an image manager in communication with the selected content server;
adding the selected content server to the load-bearing system, wherein all of the content servers on the load-bearing system including the selected content server use the identical hosted content;
detecting a change in demand greater than a pre-configured threshold; and
adding a content server to the load-bearing system if the number of content servers on the load-bearing system is less than a maximum number assigned to the hosted identical content,
wherein the hosted identical content is assigned a priority level of a plurality of priority levels, and wherein selecting an available content server comprises selecting an available content server having a lowest priority level and wherein the available content server having a least number of active sessions of the number of content servers is selected.
30. A system comprising:
a first network having client servers connected to an Internet;
a second network connected to the Internet, the second network comprising:
content servers connected to a management server, a first subset of the content servers providing a load bearing system, the management server including a means for detecting a change in demand for content server resources across the load-bearing system; and
means for automatically modifying a number of content servers in the first subset of content servers on the load bearing system in response to the change in demand, wherein automatically modifying the number of content servers on the load-bearing system comprises:
selecting an available content server on the Internet;
loading identical content from a management server onto the selected content server by an image manager in communication with the selected content server;
adding the selected content server to the load-bearing system, wherein all of the content servers on the load-bearing system including the selected content server use the identical hosted content;
detecting a change in demand greater than a pre-configured threshold; and
adding a content server to the load-bearing system if the number of content servers on the load-bearing system is less than a maximum number assigned to the hosted identical content,
wherein the hosted identical content is assigned a priority level of a plurality of priority levels, arid wherein selecting an available content server comprises selecting an available content server having a lowest priority level and wherein the management server selects the available content server having a least number of active sessions.
31. A system comprising:
a network comprising a plurality of content servers,
a plurality of load-bearing systems, wherein each of the load-bearing systems comprises one or more of the plurality of content servers; and
a management server configured to:
identify a load-bearing system with insufficient load capacity,
identify an available content server from one or more idle servers not already allocated to any of the load-bearing systems,
allocate the identified content server to the load-bearing system with insufficient capacity,
cause content to be copied onto the identified content server, wherein the content is identical to content associated with the load-bearing system with insufficient capacity,
detect a change in demand greater than a pre-configured threshold; and
add a content server to the load-bearing system if the number of content servers on the load-bearing system is less than a maximum number assigned to the hosted identical content,
wherein the identical content is assigned a priority level of a plurality of priority levels, and wherein identifying an available content server comprises identifying an available content server having a lowest priority level and wherein the available content server having a least number of active sessions of the number of content servers is selected.
Description
BACKGROUND

This invention relates to automated server replication.

The popularity of the World Wide Web as a communications medium lies in the richness of its information content and ease of use. Information in this medium exists as objects in a widely distributed collection of internetworked servers, each object uniquely addressable by its own Uniform Resource Locator (URL). The proliferation of commercial applications on the World Wide Web brings with it an increasing number of users making ever-increasing numbers of requests for web content. The problems of latency and bandwidth considerations manifest themselves in delay and lost information.

Network architects respond using an array of solutions, one of which is the server farm. This involves the use of multiple web servers with identical content, or the segmentation based upon functionality. For example, two servers for web functions, two for File Transfer Protocol (FTP), two as a database, and so forth. The use of multiple servers solves one problem at the expense of creating another. If there are multiple servers, how does the end user locate a particular web site? Presently, names and Universal Resource Locator (URLs) are resolved into unique single addresses by a Domain Name Service (DNS) residing in a DNS server. DNS servers maintain a list of domain names cross referenced to individual Internet Protocol (IP) addresses. However, if multiple web servers or server farms are used, a modified version of DNS service is used. A common approach to this problem is to modify the DNS system to be aware of a one-to-many mapping of names-to-IP-addresses. Thus, the DNS will return an IP address that comes from a list of possible IP addresses that correspond to a particular web object. Thus, from one moment to the next, a DNS query will resolve to different IP addresses. In this example, the modified DNS decides which IP address to return based on how busy each of the servers is.

In current network management systems, there are various methods of detecting and monitoring the load across a server or a server farm. One system uses a load capacity detection agent to monitor the load across a server or a server farm. In this system, when the load detection agent detects that a server farm, for example, is experiencing excess load, the agent notifies a system administrator of the system. The system administrator may decide to manually take action to either reduce the load across the server farm, or alternatively, increase the available load capacity by adding a server to the server farm. Generally, the system administrator adds a server by manually identifying an additional available server, and then modifying the entries in the load management system to include the IP address of the recently-added content server.

SUMMARY

In general, in one aspect, the invention provides a method and apparatus, including a computer program apparatus, implementing techniques for detecting a change in demand for server resources across a load-bearing system having one or more content servers hosting identical content, the load-bearing system being connected to a network of content servers; and automatically modifying the number of content servers on the load-bearing system in response to the change in demand.

Each content server on the network may be categorized as active or idle. The hosted content may be assigned a priority level, and a number defining a maximum number of content servers on the load-bearing system. A content server may be added to the load-bearing system if the change in demand is greater than a pre-configured threshold and the number of content servers on the load-bearing system is less than a maximum number assigned to the hosted content. The number of content servers may be modified by selecting an available content server on the network; loading hosted content onto the selected content server; and adding the selected content server to the load-bearing system. All of the content servers on the load-bearing system including the selected content server host identical content. The available content server having the lowest priority level, the highest available load capacity, or the least number of active sessions may be selected.

The hosted content may be assigned a number defining a minimum number of content servers on the load-bearing system. A content server may be removed from the load-bearing system if the change in demand is greater than a pre-configured threshold and the number of content servers on the load-bearing system is greater than a minimum number assigned to the hosted content. The content server having the highest available load capacity or the least number of active sessions may be removed.

Embodiments may have one or more of the following advantages. The invention uses scripting, or other software techniques, to automate the addition or removal of a content server from a load-bearing system. Automating the addition and removal of content servers gives, for example, a web hosting operation a way to manipulate server resources between high-activity servers and low-activity servers without requiring any user intervention. In particular, the invention serves the needs of “seasonal” or “spiky” web applications, such as tax preparation services or Superbowl-related web sites, which experience a tremendous increase in the number of hits at specific times of the year.

The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the invention will be apparent from the description and drawings, and from the claims.

DESCRIPTION OF DRAWINGS

FIGS. 1 a-1 d are block diagrams illustrating an internetwork topology including an network of content servers and a management server.

FIG. 2 is a flowchart of a process for automatically modifying the number of content servers on a load-bearing system.

Like reference symbols in the various drawings indicate like elements.

DETAILED DESCRIPTION

Referring to FIGS. 1 a-1 d, an exemplary internetwork 100 includes a network of servers 102 connected to a network of clients 104 through the Internet 106. The network of servers 102 includes a management server 108 and a group of content servers 110.

The content servers 110 are nodes on the network 102 that perform the actual serving of content, for example, Web pages or FTP files. Although only nine content servers 110 are shown in FIGS. 1 a through 1 d, it will be understood that any number of content servers may be connected to the network 102. Each content server 110 is capable of receiving queries from clients, doing substantially all the processing necessary to formulate responses to the queries, and providing these responses to the clients. Web servers, for example, respond to requests from clients (e.g., through browser software) for access to files and data. Other types of servers allow clients to share access to network devices, such as shared printers or disk storage.

In one exemplary commercial setting, each content server 110 is a managed node on the network 102 maintained by a network operator, such as Genuity Inc. of Woburn, Mass. By the term “managed node”, it is meant that each content server 110 runs a management process that allows another computer to query the managed node for information. For example, Simple Network Management Protocol (SNMP) describes how a computer formats a message to send to the managed node. Software on the managed node, called an SNMP agent (not shown), examines SNMP messages it receives, and responds accordingly. Each SNMP agent maintains a local database of variables that describe the state of the content server 110 and may, optionally, affect its operation. Each SNMP agent's local database includes, but need not be limited to the following: the number of packets and bytes sent and received from the Internet 106, the number of broadcasts, the current output queue size, the current transaction rate, the current processor utilization, and the current disk utilization.

Content servers 110 are the systems which store information that may be accessed using web browser software such as Netscape Communicator® and Microsoft's Internet Explorer®. Content servers transmit their information in response to receiving a message of a format specified by Hyper Text Transfer Protocol (HTTP). The format of the server's response is also specified by HTTP, and is understood by web browser software.

Network management on the network 102 can be done from management servers, an example of which is shown as management server 108, which are general-purpose computers running management software. The management server 108 interacts with the SNMP agents in the content servers 110 using the SNMP protocol. This protocol allows the management server 108 to query the state of an agent's local variables, and change them if necessary. For example, the management server 108 can issue commands and get responses that allow the management server 108 to monitor the resources available (i.e., available load capacity) on each content server 110, and express them in a way that enables the content servers 110 to be categorized as active or idle. In one example, the management server 108 only considers the CPU resource, and neglects all others. In other implementations, the management server 108 uses a more complex combination of considerations, with load metrics ranging from the instantaneous CPU utilization and IO queue length, through to a linear combination of CPU, memory and IO queue lengths. The management server 108 can also modify network routing tables, and change the status of network links and devices. The collection of all possible variables available via SNMP is given in a data structure called the Management Information Base (MIB), which is formally defined in the Internet Engineering Task Force (IETF) Request For Comment (RFC) 1213. The IETF is a large open international community of network designers, operators, vendors, and researchers concerned with the evolution of the Internet architecture and smooth operation of the Internet—it is open to any individual.

The management server 108 also houses several other software components, which include in one implementation, an image manager 116, and a content storage system 118. In the illustrated examples on FIGS. 1 a-1 d, a single server implements the software components of the management server 108. However, it should be noted that two or more servers connected to the network 102 may implement the software components.

The router 114 uses any one of a number of dynamic routing algorithms (e.g., distance vector routing and link state routing) to decide where to send packets addressed to a particular IP address; for example, how to get to a particular content server which are all distinguished based on their assigned IP address. Dynamic routing algorithms change their routing decisions in response to changes in the topology of the network 102. A set of files is stored in the content storage system 118. Each file contains content data, applications and all the necessary software required to implement a web site presence on the Internet 106. Each file can be loaded onto a content server 110 by the image manager 116. In one implementation, the image manager 116 maintains a table (shown below) that includes, for each file, a priority level, a minimum number and a maximum number of content servers 110 that can be used to implement the web site. The priority level indicates to the management server 108 the relative importance—to the network operator, Genuity Inc., for example—of implementating a particular web site in situations in which several web sites are vying for limited server capacity. In one implementation, a five-point scale is used to designate a priority level: “highest”, “high”, “medium”, “low” and “lowest”. Generally, the higher the priority level assigned to a file, the more server resources (up to the maximum number of content servers 110 identified in the table) are allocated to implement the web site. By default, content servers 110 that are idle are assigned a “lowest” priority level. When a file having a “highest” priority level is loaded onto a content server 110 that is idle, for example, the priority level of the content server 110 changes from “lowest” to “highest”.

Assume, for example, that three files—file “A”, file “B”, and file “C”—are stored in the content storage system 118. The second, third and fourth table entries are populated with the following data:

File Priority Level Min. Number Max. Number
A highest 1 7
B medium 1 3
C low 1 3

Initially, each file is loaded and run on one or more content servers 110, indicated in dashed lines in FIG. 1 a as load-bearing system A 120, load-bearing system B 122, and load-bearing system C 124. If a load-bearing system, such as load-bearing system A 120, has multiple content servers 110, the load on the system is distributed using one of the following schemes: (1) a load-sharing scheme; (2) a load-balancing scheme; or (3) a load-leveling scheme. Generally, content servers 110 in a load-sharing system that utilizes the load-sharing scheme are viewed in binary. That is, the server is either idle or busy, and load may only be placed on idle servers. Load-balancing schemes attempt to ensure that the load on each content server 110 in the system is within a small degree of the load present on every other content server in the system. Load-leveling schemes can be viewed as the middle ground between the load-sharing and load-balancing schemes. Rather than trying to obtain an even distribution across the system, or utilizing only the content servers 110 that are idle, the load-leveling scheme distributes load in a manner that minimizes congestion.

Referring to FIG. 2, a process 200 residing in the management server 108 periodically checks (202) the available load capacity on each load-bearing system. In one implementation, the process 200 polls each content server 110 in a load-bearing system to determine its available load capacity.

If the process 200 detects (204) that the load on the load-bearing system B 122, for example, is greater than a preconfigured threshold level (i.e., there is insufficient aggregate available load capacity), the process then determines (206) whether the number of content servers 110 in the load-bearing system B 122 is less than the maximum number that may be allocated to that system. If so, the process 200 will add a content server 110 to the load-bearing system B 122 if one is available. By use of the term “available”, it is meant that the content server 110 is idle and may be added to a load-bearing system, or alternatively, the content server has a lower priority level and may be removed from a particular load-bearing system and allocated to a different load-bearing system. For example, as shown in FIG. 1 b, if the load-bearing system C 124 is implemented by a single content server 124 a, the content server 124 a is not available for re-allocation to either of the other two load-bearing systems 120 and 122, because the network operator has designated in the table that at least one content server 110 in the network 102 must be allocated to the load-bearing system C 124.

The process 200 first polls all of the content servers 110 on the network 102 to determine (210) if there is an available content server 110 on the network 102. If none of the content servers 110 are available, the process 200 logs and signals the event (208) to the network operator maintaining the network 102. Otherwise, the process 200 selects (212) one of the available content servers for addition to the load-bearing system B 122. If there are multiple available content servers 110, the process 200 will typically select one that is idle for addition to the load-bearing system B 122. However, if all of the available content servers 110 on the network 102 are active, as shown in FIG. 1 c, the process 200 makes the selection as follows:

    • (1) If there is only one available content server 110, the process 200 selects that content server 110.
    • (2) If there are multiple available content servers 110, the process 200 selects the content server 110 having the lowest priority level.
    • (3) If there are multiple available content servers 110 having the lowest priority level, the process 200 polls each of those content servers 110 to determine which content server 110 has the highest available load capacity and selects that content server 110. Alternatively, the process 200 polls each of those content servers 110 to determine which content server 110 has the least number of running processes in progress (called “active sessions”) and selects that content server 110.

Once the selection is made, say, for example, the process 200 selects the content server having an IP address of “128.11.234.59” 124 b in the load-bearing system C 124, as shown in FIG. 1 c, the process 200 can be configured to immediately stop all future client queries directed to the load-bearing system C 124 from being sent to the selected content server 124 b for processing. The process 200 can also be configured to wait until all of the active sessions on the selected content server 124 b have been terminated before removing that content server 124 b from the load-bearing system C 124. Once removed, the process 200 retrieves the file “B” from the content storage system 118 and uses the image manager 116 to load (214) it onto the selected content server 124 b. Referring to FIG. 1 d, the process 200 then starts the selected content server 124 b having the recently-loaded file “B”, and modifies the DNS system to add (216) the content server having an IP address of “128.11.234.59” 124 b to the load-bearing system B 122. Thereafter, when a client requests a service by entering in a web browser the URL for the web site implemented by the load-bearing system B 122, the request can be directed to the content server 124 b.

Referring to FIG. 1 c, 1 f the process 200 detects (218) that the load on the load-bearing system B 122, for example, is less than a preconfigured threshold level, the process 200 then determines (220) whether the number of content servers 110 in the load-bearing system B 122 is more than the minimum number that may be allocated to that system 122. If so, the process 200 may select (222) a content server 110 from the load-bearing system B 122 for removal if the aggregate available load capacity of the load-bearing system B, the historical demand for services implemented by the load-bearing system B, as well as damping considerations, among others, warrants removal of a content server. The process 200 selects a content server for removal much in the same manner described above. That is, the selection may be made by polling each of the content servers 110 in the load-bearing system B 122 to determine which content server 110 has the highest available load capacity and selecting that content server 110. Alternatively, the selection may be made by polling each of those content servers 110 to determine which content server 110 has the least number of active sessions and selecting that content server 110. The process 200 can be configured to wait until all of the active sessions on the selected content server 110 have been terminated before removing (224) that content server 110 from the load-bearing system B 122, and categorizing it as idle.

Other embodiments are within the scope of the following claims.

Citations de brevets
Brevet cité Date de dépôt Date de publication Déposant Titre
US44955707 janv. 198222 janv. 1985Hitachi, Ltd.Processing request allocator for assignment of loads in a distributed processing system
US45919839 juil. 198427 mai 1986Teknowledge, Inc.Hierarchical knowledge system
US459470416 nov. 198410 juin 1986Compagnie Industrielle Des Telecommunications Cit-AlcatelSpare subscriber terminal device in a digital concentrator
US472601721 mai 198516 févr. 1988Fla.Multidrop data concentrator communication network
US480364125 nov. 19877 févr. 1989Tecknowledge, Inc.Basic expert system tool
US48397986 nov. 198513 juin 1989Hitachi, Ltd.Method and apparatus for controlling job transfer between computer systems
US484778413 juil. 198711 juil. 1989Teknowledge, Inc.Knowledge based tutor
US492043212 janv. 198824 avr. 1990Eggers Derek CSystem for random access to an audio video data library with independent selection and display at each of a plurality of remote locations
US492241724 oct. 19861 mai 1990American Telephone And Telegraph CompanyMethod and apparatus for data hashing using selection from a table of random numbers in combination with folding and bit manipulation of the selected random numbers
US494393215 avr. 198724 juil. 1990Cimflex Teknowledge CorporationArchitecture for composing computational modules uniformly across diverse developmental frameworks
US494918716 déc. 198814 août 1990Cohen Jason MVideo communications system having a remotely controlled central source of video and audio data
US494924815 juil. 198814 août 1990Caro Marshall ASystem for shared remote access of multiple application programs executing in one or more computers
US502923212 janv. 19892 juil. 1991Cycle-Sat., Inc.Satellite communications network
US51307921 févr. 199014 juil. 1992Usa Video Inc.Store and forward video system
US51329927 janv. 199121 juil. 1992Paul YurtAudio and video transmission and receiving system
US51367168 mars 19904 août 1992Digital Equipment CorporationSession control in network for digital data processing system which supports multiple transfer protocols
US517241320 déc. 199015 déc. 1992SasktelSecure hierarchial video delivery system and method
US519157318 sept. 19902 mars 1993Hair Arthur RMethod for transmitting a desired digital video or audio signal
US52532752 avr. 199212 oct. 1993H. Lee BrowneAudio and video transmission and receiving system
US525334111 avr. 199112 oct. 1993Rozmanith Anthony IRemote query communication system
US528749916 mai 199115 févr. 1994Bell Communications Research, Inc.Methods and apparatus for information storage and retrieval utilizing a method of hashing and different collision avoidance schemes depending upon clustering in the hash table
US528753721 sept. 199215 févr. 1994Data General CorporationDistributed processing system having plural computers each using identical retaining information to identify another computer for executing a received command
US529155419 août 19921 mars 1994Tv Answer, Inc.Shared-price custom video rentals via interactive TV
US53414776 août 199323 août 1994Digital Equipment CorporationBroker for computer network server selection
US537153215 mai 19926 déc. 1994Bell Communications Research, Inc.Communications architecture and method for distributing information services
US54103432 avr. 199325 avr. 1995Bell Atlantic Network Services, Inc.Video-on-demand services using public switched telephone network
US54144557 juil. 19939 mai 1995Digital Equipment CorporationSegmented video on demand system
US544238928 déc. 199215 août 1995At&T Corp.Program server for interactive television system
US54423907 juil. 199315 août 1995Digital Equipment CorporationVideo on demand with memory accessing and or like functions
US54427499 juil. 199315 août 1995Sun Microsystems, Inc.Network video server system receiving requests from clients for specific formatted data through a default channel and establishing communication through separate control and data channels
US547162220 avr. 199528 nov. 1995Paralogic, Inc.Run-time system having nodes for identifying parallel tasks in a logic program and searching for available nodes to execute the parallel tasks
US547561523 déc. 199312 déc. 1995U S West Advanced Technologies, Inc.Method and system for sizing interactive video delivery systems
US550873222 mars 199316 avr. 1996International Business Machines CorporationData server, control server and gateway architecture system and method for broadcasting digital video on demand
US55155116 juin 19947 mai 1996International Business Machines CorporationHybrid digital/analog multimedia hub with dynamically allocated/released channels for video processing and distribution
US55194351 sept. 199421 mai 1996Micropolis CorporationMulti-user, on-demand video storage and retrieval system including video signature computation for preventing excessive instantaneous server data rate
US552828130 juil. 199318 juin 1996Bell Atlantic Network ServicesMethod and system for accessing multimedia data over public switched telephone network
US553962123 juin 199523 juil. 1996Elonex Technologies, Inc.Network communication unit with client and resource node array double layer ICs on printed board with connectors on housing
US554208715 oct. 199330 juil. 1996Hewlett-Packard CompanyLinear hashing for distributed records
US554431311 mai 19946 août 1996International Business Machines CorporationBaton passing optimization scheme for load balancing/configuration planning in a video-on-demand computer system
US554432726 juil. 19946 août 1996International Business Machines CorporationLoad balancing in video-on-demand servers by allocating buffer to streams with successively larger buffer requirements until the buffer requirements of a stream can not be satisfied
US555057719 mai 199427 août 1996Alcatel N.V.Video on demand network, including a central video server and distributed video servers with random access read/write memories
US55508638 oct. 199327 août 1996H. Lee BrowneAudio and video transmission and receiving system
US555098224 juin 199327 août 1996Starlight NetworksVideo application server
US555731722 mai 199517 sept. 1996Nec CorporationVideo-on-demand system with program relocation center
US557264319 oct. 19955 nov. 1996Judson; David H.Web browser with dynamic display of information objects during linking
US559028813 mars 199531 déc. 1996Restaurant Technology, Inc.Distributed data processing system and method utilizing peripheral device polling and layered communication software
US559261114 mars 19957 janv. 1997Network Integrity, Inc.Stand-in computer server
US559491026 nov. 199314 janv. 1997Ibm Corp.Interactive computer network and method of operation
US56030267 déc. 199411 févr. 1997Xerox CorporationApplication-specific conflict resolution for weakly consistent replicated databases
US561964830 nov. 19948 avr. 1997Lucent Technologies Inc.Message filtering techniques
US562365615 déc. 199422 avr. 1997Lucent Technologies Inc.Script-based data communication system and method utilizing state memory
US562578131 oct. 199529 avr. 1997International Business Machines CorporationItinerary list for interfaces
US56278296 juin 19956 mai 1997Gleeson; Bryan J.Method for reducing unnecessary traffic over a computer network
US56300674 juin 199613 mai 1997International Business Machines CorporationSystem for the management of multiple time-critical data streams
US563399918 déc. 199527 mai 1997Nonstop Networks LimitedWorkstation-implemented data storage re-routing for server fault-tolerance on computer networks
US563400611 oct. 199527 mai 1997International Business Machines CorporationSystem and method for ensuring QOS in a token ring network utilizing an access regulator at each node for allocating frame size for plural transmitting applications based upon negotiated information and priority in the network
US563844323 nov. 199410 juin 1997Xerox CorporationSystem for controlling the distribution and use of composite digital works
US564471410 avr. 19951 juil. 1997Elonex Plc, Ltd.Video collection and distribution system with interested item notification and download on demand
US564667630 mai 19958 juil. 1997International Business Machines CorporationScalable interactive multimedia server system for providing on demand data
US56491867 août 199515 juil. 1997Silicon Graphics IncorporatedSystem and method for a computer-based dynamic information clipping service
US56597291 févr. 199619 août 1997Sun Microsystems, Inc.Method and system for implementing hypertext scroll attributes
US566636225 juil. 19959 sept. 19973Com CorporationMethod and apparatus for asynchronous PPP and synchronous PPP conversion
US567127913 nov. 199523 sept. 1997Netscape Communications CorporationElectronic commerce using a secure courier system
US567573427 févr. 19967 oct. 1997Parsec Sight/Sound, Inc.System for transmitting desired digital video or audio signals
US568251230 juin 199528 oct. 1997Intel CorporationUse of deferred bus access for address translation in a shared memory clustered computer system
US569951331 mars 199516 déc. 1997Motorola, Inc.Method for secure network access via message intercept
US571297920 sept. 199527 janv. 1998Infonautics CorporationMethod and apparatus for attaching navigational history information to universal resource locator links on a world wide web page
US571545331 mai 19963 févr. 1998International Business Machines CorporationWeb server mechanism for processing function calls for dynamic data queries in a web page
US572191414 sept. 199524 févr. 1998Mci CorporationSystem and method for hierarchical data distribution
US573483126 avr. 199631 mars 1998Sun Microsystems, Inc.System for configuring and remotely administering a unix computer over a network
US574042328 déc. 199514 avr. 1998Csg Systems, Inc.System and method for accessing distributed data on a plurality of databases
US574276219 mai 199521 avr. 1998Telogy Networks, Inc.Network management gateway
US575196131 janv. 199612 mai 1998Bell Communications Research, Inc.Integrated internet system for translating logical addresses of internet documents to physical addresses using integrated service control point
US57615075 mars 19962 juin 1998International Business Machines CorporationClient/server architecture supporting concurrent servers within a server with a transaction manager providing server/connection decoupling
US576166315 mai 19972 juin 1998International Business Machines CorporationMethod for distributed task fulfillment of web browser requests
US57649067 nov. 19959 juin 1998Netword LlcUniversal electronic resource denotation, request and delivery system
US57746605 août 199630 juin 1998Resonate, Inc.World-wide-web server with delayed resource-binding for resource-based load balancing on a distributed resource multi-node network
US5774668 *7 juin 199530 juin 1998Microsoft CorporationSystem for on-line service in which gateway computer uses service map which includes loading condition of servers broadcasted by application servers for load balancing
US577798919 déc. 19957 juil. 1998International Business Machines CorporationTCP/IP host name resolution for machines on several domains
US578405828 mai 199621 juil. 1998Sun Microsystems, Inc.User-controllable persistent browser display pages
US579695221 mars 199718 août 1998Dot Com Development, Inc.Method and apparatus for tracking client interaction with a network resource and creating client profiles and resource database
US57991419 juin 199525 août 1998Qualix Group, Inc.Real-time data protection system and method
US58021066 déc. 19961 sept. 1998Packeteer, Inc.Method for rapid data rate detection in a packet communication environment without data rate supervision
US580229130 mars 19951 sept. 1998Sun Microsystems, Inc.System and method to control and administer distributed object servers using first class distributed objects
US581276920 sept. 199522 sept. 1998Infonautics CorporationMethod and apparatus for redirecting a user to a new location on the world wide web using relative universal resource locators
US581566419 mars 199629 sept. 1998Fujitsu LimitedAddress reporting device and method for detecting authorized and unauthorized addresses in a network environment
US582884719 avr. 199627 oct. 1998Storage Technology CorporationDynamic server switching for maximum server availability and load balancing
US583250629 mars 19963 nov. 1998Intel CorporationDirectory for network servers
US583251426 juin 19963 nov. 1998Microsoft CorporationSystem and method for discovery based data recovery in a store and forward replication process
US583571810 avr. 199610 nov. 1998At&T CorpURL rewriting pseudo proxy server
US58453032 oct. 19961 déc. 1998Netpodium, Inc.Document processing using frame-based templates with hierarchical tagging
US585697413 févr. 19965 janv. 1999Novell, Inc.Internetwork address mapping gateway
US58623399 juil. 199619 janv. 1999Webtv Networks, Inc.Client connects to an internet access provider using algorithm downloaded from a central server based upon client's desired criteria after disconnected from the server
US586770619 déc. 19962 févr. 1999International Business Machines Corp.Method of load balancing across the processors of a server
US58677994 avr. 19962 févr. 1999Lang; Andrew K.Information system and method for filtering a massive flow of information entities to meet user information classification needs
US587054623 déc. 19979 févr. 1999Infoseek CorporationMethod and apparatus for redirection of server external hyper-link reference
US587055911 avr. 19979 févr. 1999Mercury InteractiveSoftware system and associated methods for facilitating the analysis and management of web sites
US587821231 juil. 19952 mars 1999At&T Corp.System for updating mapping or virtual host names to layer-3 address when multimedia server changes its usage state to busy or not busy
US58840382 mai 199716 mars 1999Whowhere? Inc.Method for providing an Internet protocol address with a domain name server
US58901716 août 199630 mars 1999Microsoft CorporationComputer system and computer-implemented method for interpreting hypertext links in a document when including the document within another document
US6052718 *7 janv. 199718 avr. 2000Sightpath, IncReplica routing
US6167427 *28 nov. 199726 déc. 2000Lucent Technologies Inc.Replication service system and method for directing the replication of information servers based on selected plurality of servers load
US6175869 *8 avr. 199816 janv. 2001Lucent Technologies Inc.Client-side techniques for web server allocation
US6314465 *11 mars 19996 nov. 2001Lucent Technologies Inc.Method and apparatus for load sharing on a wide area network
US6374299 *26 janv. 200016 avr. 2002Merrill Lynch & Co. Inc.Enhanced scalable distributed network controller
US6412002 *15 nov. 199925 juin 2002Ncr CorporationMethod and apparatus for selecting nodes in configuring massively parallel systems
US6484204 *24 mai 200119 nov. 2002At&T Corp.System and method for allocating requests for objects and managing replicas of objects on a network
US6574612 *29 juin 19993 juin 2003International Business Machines CorporationLicense management system
US6601084 *19 déc. 199729 juil. 2003Avaya Technology Corp.Dynamic load balancer for multiple network servers
US6636499 *2 déc. 199921 oct. 2003Cisco Technology, Inc.Apparatus and method for cluster network device discovery
US6795858 *29 déc. 200021 sept. 2004Cisco Technology, Inc.Method and apparatus for metric based server selection
US20010042139 *1 août 200115 nov. 2001Aprisma Management TechnologiesReplicated resource management system for managing resources in a distributed application and maintaining a relativistic view of state
US20020026560 *9 oct. 199828 févr. 2002Kevin Michael JordanLoad balancing cooperating cache servers by shifting forwarded request
US20020032777 *9 avr. 200114 mars 2002Yoko KawataLoad sharing apparatus and a load estimation method
US20020078263 *18 déc. 200020 juin 2002Darling Christopher L.Dynamic monitor and controller of availability of a load-balancing cluster
US20020166117 *10 sept. 20017 nov. 2002Abrams Peter C.Method system and apparatus for providing pay-per-use distributed computing resources
US20020194350 *30 avr. 200219 déc. 2002Lu Leonard L.Content-aware web switch without delayed binding and methods thereof
US20030041238 *15 août 200127 févr. 2003International Business Machines CorporationMethod and system for managing resources using geographic location information within a network management framework
US20030065761 *27 sept. 20023 avr. 2003Nevton CerejaSystem and method of creating and maintaining a replicated naming service to support a telecommunications network
US20030154279 *26 mars 200114 août 2003Ashar AzizSymbolic definition of a computer system
US20030191822 *17 avr. 20039 oct. 2003Leighton F. ThomsonMethod and system for providing content delivery to a set of participating content providers
Citations hors brevets
Référence
1"Content Management Technology/Industry News," Content Technologies Trends and Advice, Gilbane Report, News for June, 1999 [21 pages].
2"Exporting Web Server Final Report," cs.technion.ac.il/Labs/Lccn/projects/spring97/project4/final<SUB>-</SUB>report.html, Spring 1997 (downloaded Jul. 7, 2007).
3Adler, R. M., "Distributed Coordination Models for Client/Server Computing," Computer 28, 4 (Apr. 1995), 14-22.
4Andresen et al., "SWEB: Towards a Scalable World Wide Web Server on Multicomputers", Proc. IPPS, (Apr. 15, 1996), 850-856.
5Andresen, D., et al., Multiprocessor scheduling with client resources to improve the response time of WWW applications, Proc. 11<SUP>th </SUP>Intl Conf. on Supercomputing (Austria, Jul. 1997). ICS '97. ACM Press, NY, NY, 92-99.
6Basturk, E., et al., "Using network layer anycast for load distribution in the Internet", Tech. Rep., IBM T.J. Watson Research Center, 1997 (21 pgs.).
7Berners-Lee et al., RFC 1738-"Uniform Resource Locators (URL)", University of Minnesota, Dec. 1994, 1-25.
8Bestavros, A., "Speculative Data Dissermination and Service to Reduce Server Load, Network Traffic and Service Time in Distributed Information Systems", In Proc. ICDE '96: The 1996 Int'l Conf. on Data Engineering, (Mar. 1996), 4 pages.
9Bestavros, et al., "Server-Initiated Document Dissemination for the WWW," IEEE Data Engineering Bulletin 19(3):3-11, Sep. 1996, 1-8.
10Bhattacharjee et al., "Application-layer anycasting," in Proc. IEEE Infocom '97, 1997, 1-9.
11Braun, H., et al., "Web traffic characterization: an assessment of the impact of caching documents from NCSA's web server", Comput. Netw. ISDN Syst. 28, 1-2 (Dec. 1995), 37-51.
12Brisco, T. P. RFC 1794: DNS support for load balancing, Apr. 1995, 1-7.
13Carter et al., "Dynamic server selection using bandwidth probing in wide-area networks," Tech. Rep. BU-CS-96-007, Comp. Sci. Dept., Boston University, Mar. 1996, 1-20.
14Carter et al., Server selection using dynamic path characterization in Wide-Area Networks, IEEE Infocom '97, (pp. 1014-1021), 1997, 1-8.
15Carter, J. Lawrence et al., "Universal Classes of Hash Functions", Journal of Computer and System Sciences, vol. 18, No. 2, 143-154 (Apr. 1979), 106-112.
16Chankhunthod, A. et al., "A Hierarchical Internet Object Cache", Proc. Of the 1996 USENIX Technical Conf., Jan. 1996, pp. 153-163.
17Cisco Systems, Inc., "Cisco Distributed Director" cisco.com/warp/public/751/distdir/dd<SUB>-</SUB>wp.htm, 1997, 16 pages.
18Cisco Systems, Inc., Cisco DistributedDirector 2500 Series Installation and Configuration Guide, pp. xix-xxii; 1-1 to 1-12; 6-1 to 6-18; 7-1 to 7-18; 8-1 to 8-24, pub. Date unknown, downloaded Apr. 2007: cisco.com/univercd/cc/td/doc/product/iaabu/distrdir/dd2501/.
19Cisco Systems, Inc., Cisco DistributedDirector 4700-M Installation and Configuration Guide, pp. Xix-xxii; 1-1 to 1-14; 7-1 to 7-18, 8-1 to 8-20; pub. Date unknown, [downloaded Apr. 2007 from cisco.com/univercd/cc/td/doc/product/iaabu/distrdir/dd4700m/].
20Cohen, J., et al., "Cache Array Routing Protocol v1.1", Sep. 29, 1997; tools.ietf.org/id/draft-vinod-carp-v1-01.txt (Last-Modified: Wed, Oct. 1, 1997), 8 pages.
21Colajanni, M. and Yu, P. S. 1997. "Adaptive TTL schemes for load balancing of distributed Web servers. Sigmetrics" Perform. Eval. Rev. 25, 2 (Sep. 1997), 36-42.
22Cormen, T. H., et al., "Introduction to Algorithms", The MIT Press, Cambridge, Massachusetts, (1990), 219-243, 991-993.
23Crovella et al., "Dynamic server selection in the internet", 3rd IEEE Workshop on the Arch. and Implementation of High Performance Computer Sys. '95, pp. 158-162, Aug. 1995.
24Danzig, P. B., et al., An analysis of wide-area name server traffic: a study of the Internet Domain Name System, Conf. Proc. Communications Architectures & Protocols (Aug. 1992). D. Oran, Ed. Sigcomm '92, ACM Press, New York, NY, 281-292.
25De Bra, P.M.E., et al., "Information Retrieval in the World Wide Web: Making Client-Based Searching Feasible", Computer Networks and ISDN Systems, NL, North Holland Publishing, Amsterdam, vol. 27, No. 2, ISSN: 0169-7552, (Nov. 1, 1994), 183-192.
26Deering, S.E., et al., "Multicast routing in datagram internetworks and extended LANs," ACM Trans. Comput. Syst. 8, 2 (May 1990), 85-110.
27Devine, R., "Design and Implementation of DDH: A Distributed Dynamic Hashing Algorithm", In Proc. 4th Int'l Conf. on Foundations of Data Organizations and Algorithms, (1993), 101-114.
28Doi, K. "Super Proxy Script-How to make distributed proxy servers by URL hashing," Sharp Corp., naragw.sharp.co.jp/sps/, dates unknown (1996-2000), download Jul. 7, 2007.
29Duane Wessels, "Intelligent Caching for World-Wide Web Objects", Masters Thesis, University of Colorado, 1995, 1-84.
30Feeley, M., et al., "Implementing Global Memory Management in a Workstation Cluster", In Proc. 15th ACM Symp. on Operating Systems Principles, (1995), 201-212.
31Floyd, S., et al., "A Reliable Multicast Framework for Light-Weight Sessions and Application Level Framing", In Proc. of ACM Sigcomm '95, 342-356, Aug. 1995.
32Fox, A., "A Framework for Separating Server Scalability and Availability from Internet Application Functionality", PhD thesis, University of California, Berkeley, 1998, 163 pages.
33Fox, A., et al., "Cluster-based scalable network services", Proc. 16th ACM Symp. on Operating Systems Principles (Saint Malo, France, Oct. 5-8, 1997). W. M. Waite, Ed. SOSP '97. ACM Press, New York, NY, 78-91.
34Fredman, M., et al., "Storing a Sparse Table with 0(1) Worst Case Access Time", J. ACM, vol. 31, No. 3, (Jul. 1984), 538-544.
35Goldszmidt, et al., "Load Distribution for Scalable Web Servers: Summer Olympics 1996-A Case Study," In Proc. 8th IFIP/IEEE Int'l Workshop on Distributed Systems: Operations and Management, Sydney, Australia, Oct. 1997, 10 pages.
36Grigni, M., et al., "Tight Bounds on Minimum Broadcasts Networks", Siam J. Disc. Math. 4 (1991), 207-222, (1991) 25 pages.
37Gulbrandsen, A., et al., "A DNS RR for specifying the location of services"(DNS SRV), Network Working Group, RFC 2052, Oct. 1996, 1-10.
38Guyton et al., "Locating nearby copies of replicated Internet servers," Proc. ACM SIGCOMM '95, pp. 288-298, 1995, 1-18.
39Gwertzman, J., et al., "The Case for Geographical Push-Caching", Proc. Workshop on Hot OS '95, (May 4, 1995), 51-55.
40Gwertzman, J., et al., "World-Wide Web Cache Consistency", Proc. 1996 USENIX Tech. Conf., pp. 141-151, San Diego, CA, Jan. 1996, 11 pages.
41IBM Technical Disclosure Bulletin, "Local Area Network Server Replacement Procedure", vol. 38, No. 1, (Jan. 1995), 235-236.
42J. Postel, "Domain Name System Structure and Delegation", RFC 1591, Mar. 1994 1-7.
43Jeff Walsh, "Global IP/PX Service Should Keep Network Delays Down", Infoworld, (Jan. 20, 1997), 1-2.
44Jeffrey et al., Proxy-Sharing Proxy Servers, IEEE, pp. 116-119, 1996, 1-4.
45Karger, D., et al., "Consistent Hashing and Random Trees: Distributed Caching Protocols for Relieving Hot Spots on the World Wide Web", In Proc. 29th Annual ACM Symp. on Theory of Computing, (May 1997), 654-663.
46Kwan et al., NCSA's World Wide Web Server: Design and Performance, IEEE, pp. 68-74, Nov. 1995, 1-23.
47Litwin, W., et al., "LH*-A Scalable, Distributed Data Structure", ACM Trans. on Database Systems, vol. 21, No. 4, pp. 480-525, 1996, 1-43.
48Luotonen et al., World-Wide Web Proxies, CERN, Apr. 1994 (modified May 24, 1994), 1-8.
49Malpani, R., et al., "Making World Wide Web Caching Servers Cooperate", in Proc. 4th Int'l. World Wide Web Conf. (Dec. 1995), 10 pages (downloaded from .w3.org/Conferences/WWW4/Papers/59/ on Jul. 7, 2007), 10 pages.
50Mockapetris et al., "Development of the Domain Name System," Proc. SIGCOMM '88 Computer Communications Review, vol. 18, No. 4, Aug. 1988, 112-122.
51Mockapetris, P., RFC 1034: Domain Names-Concepts and Facilities, Nov. 1987, 1-55.
52Mockapetris, P., RFC 1035: Domain Names-Implementation and Specification, Nov. 1987, 1-55.
53Mourad et al., "Scalable Web Server Architectures," iscc, 2nd IEEE Symposium on Computers and Communications (ISCC '97), 1997, 12-16.
54Neil Smith, "What can Archives offer the World Wide Web?", Technical Report 11, University of Kent, Computing Laboratory, University of Kent, Canterbury, UK, 1994, 1-12.
55Nisan, N. 1990. Pseudorandom generators for space-bounded computations. In Proc. 22nd Annual ACM Symp. on theory of Computing (Baltimore, MD, U.S., May 13-17, 1990). H. Ortiz, Ed. STOC '90. ACM Press, New York, NY, 204-212.
56Oguchi et al., A Study of Caching Proxy Mechanisms Realized on Wide Area Distributed Networks, High Performance Distributed Computing, 5th Int'l Symposium, 1996 443-449.
57Palmer, M., et al., "Fido: A Cache that Learns to Fetch", In Proc. the 17th Intl Conf. on Very Large Data Bases, (Sep. 1991), 255-264.
58Panigrahy, R., "Relieving Hot Spots on the World Wide Web", Master's thesis, MIT EECS, Jun. 1997, pp. 1-66.
59Peleg, D., et al., "The Availability of Quorum Systems", Information and Computation, 123, 210-223, (1995), 31 pages.
60Peterson, Eric, "Cisco Takes Global Route", PC Week News, (Feb. 17, 1997), p. 23.
61Petri S., et al., "Load Balancing and Fault Tolerance in Workstation Clusters. Migrating Groups of Communicating Processes.", Operating Systems Review, vol. 29, No. 4, Oct. 1995, 25-36.
62Plaxton, G.C., et al., "Fast Fault-Tolerant Concurrent Access to Shared Objects", In Proc. 37th IEEE Symp. of Foundations of Computer Science. 570-579, (1996), 10 pages.
63Rabin, M. O., 1989, "Efficient dispersal of information for security, load balancing, and fault tolerance", J. ACM 36, 2(Apr. 1989), 335-348.
64Ross, K.W., "Hash-Routing for Collections of Shared Web Caches", IEEE Network Magazine, 11, 7:37-44, Nov.-Dec. 1997, 1-21.
65Schemers, R., "Ibnamed-A load balancing name server written in Perl," 1995 LISA IX Sep. 17-22, 1995 Monterey, CA, 1-12.
66Schuba, Christoph; "Addressing Weaknesses in the Domain Name System Protocol," Coast Laboratory, Dept. of Computer Sciences, Purdue University; West Layfayette, IN; Aug. 1993, p. 1-87.
67Tarjan, Robert E., et al., "Storing a Sparse Table", Commun.ACM, 22, 11, (Nov. 1979), 606-611.
68Thaler, D. G. and Ravishankar, C. V. 1998. "Using name-based mappings to increase hit rates". IEEE/ACM Trans. Netw. 6, 1 (Feb. 1998), 1-14.
69Vitter, J. S., et al., "Optimal Prefetching via Data Compression," Proc. 32nd Annual IEEE Symposium on Foundations of Computer Science (Oct. 1991), 21 pages.
70Vixie, Paul; "Name Server Operations Guide for BIND," Internet Software Consortium; La Honda, CA; p. SMM:10-2-SMM:10-30 (undated, 1996), 1-30.
71Yao, A. C. 1981. "Should Tables Be Sorted?". J. ACM 28, 3 (Jul. 1981), 615-628.
Référencé par
Brevet citant Date de dépôt Date de publication Déposant Titre
US782287130 sept. 200226 oct. 2010Level 3 Communications, LlcConfigurable adaptive global traffic control and management
US786096426 oct. 200728 déc. 2010Level 3 Communications, LlcPolicy-based content delivery network selection
US7870305 *9 mars 200711 janv. 2011Microsoft CorporationProxy association for devices
US7882230 *2 avr. 20081 févr. 2011International Business Machines CorporationMethod and system for dynamically allocating servers to compute-resources using capacity thresholds
US7979862 *21 déc. 200412 juil. 2011Hewlett-Packard Development Company, L.P.System and method for replacing an inoperable master workload management process
US820941527 févr. 201026 juin 2012Yottaa IncSystem and method for computer cloud management
US822489917 avr. 200817 juil. 2012Eloy Technology, LlcMethod and system for aggregating media collections between participants of a sharing network
US828581017 avr. 20089 oct. 2012Eloy Technology, LlcAggregating media collections between participants of a sharing network utilizing bridging
US828581117 avr. 20089 oct. 2012Eloy Technology, LlcAggregating media collections to provide a primary list and sorted sub-lists
US8397296 *6 févr. 200812 mars 2013Verizon Patent And Licensing Inc.Server resource management, analysis, and intrusion negation
US848422715 oct. 20089 juil. 2013Eloy Technology, LlcCaching and synching process for a media sharing system
US848431117 avr. 20089 juil. 2013Eloy Technology, LlcPruning an aggregate media collection
US864551724 déc. 20104 févr. 2014Level 3 Communications, LlcPolicy-based content delivery network selection
US8655775 *8 févr. 201318 févr. 2014Mastercard International IncorporatedMethod and system for merchant debit routing table change detection
US87631198 mars 201324 juin 2014Home Run Patents LlcServer resource management, analysis, and intrusion negotiation
US887465010 juil. 201228 oct. 2014Eloy Technology, LlcMethod and system for aggregating media collections between participants of a sharing network
US888059915 oct. 20084 nov. 2014Eloy Technology, LlcCollection digest for a media sharing system
US8909726 *27 août 20039 déc. 2014Cisco Technology, Inc.Priority based anycast routing
US893053821 mars 20096 janv. 2015Level 3 Communications, LlcHandling long-tail content in a content delivery network (CDN)
US919122929 janv. 201017 nov. 2015Eloy Technology, LlcRemote participation in a Local Area Network (LAN) based media aggregation network
US9203636 *31 oct. 20071 déc. 2015Level 3 Communications, LlcDistributing requests across multiple content delivery networks based on subscriber policy
US920823929 juin 20118 déc. 2015Eloy Technology, LlcMethod and system for aggregating music in the cloud
US924099831 oct. 201219 janv. 2016Shinra Technologies, Inc.Management apparatus and control method of management apparatus
US9319274 *29 mars 201219 avr. 2016Emc CorporationMethod and system for dynamic provisioning using server dormant mode for virtual server dormancy
US936331228 juil. 20107 juin 2016International Business Machines CorporationTransparent header modification for reducing serving load based on current and projected usage
US9391863 *6 mai 201412 juil. 2016Palo Alto Networks, Inc.Server resource management, analysis, and intrusion negotiation
US939619630 sept. 201419 juil. 2016Eloy Technology, LlcMethod and system for aggregating media collections between participants of a sharing network
US976269213 sept. 201012 sept. 2017Level 3 Communications, LlcHandling long-tail content in a content delivery network (CDN)
US20050044168 *3 déc. 200124 févr. 2005Agency For Science Technology And ResearchMethod of connecting a plurality of remote sites to a server
US20060136929 *21 déc. 200422 juin 2006Miller Troy DSystem and method for replacing an inoperable master workload management process
US20080133749 *6 févr. 20085 juin 2008Federal Network Systems, LlcServer resource management, analysis, and intrusion negation
US20080168301 *10 janv. 200710 juil. 2008Inventec CorporationMethod of automatically adjusting storage sources for server a system
US20080183865 *2 avr. 200831 juil. 2008Karen ApplebyMethod and System for Dynamically Allocating Servers to Compute-Resources Using Capacity Thresholds
US20080222315 *9 mars 200711 sept. 2008Microsoft CorporationProxy association for devices
US20090265416 *17 avr. 200822 oct. 2009Eloy Technology, LlcAggregating media collections between participants of a sharing network utilizing bridging
US20090265417 *17 avr. 200822 oct. 2009Eloy Technology, LlcAggregating media collections to provide a primary list and sorted sub-lists
US20090265426 *17 avr. 200822 oct. 2009Eloy Technology, LlcMethod and system for aggregating media collections between participants of a sharing network
US20090307329 *6 juin 200810 déc. 2009Chris OlstonAdaptive file placement in a distributed file system
US20100070490 *17 sept. 200818 mars 2010Eloy Technology, LlcSystem and method for enhanced smart playlists with aggregated media collections
US20100094833 *15 oct. 200815 avr. 2010Concert Technology CorporationCaching and synching process for a media sharing system
US20100114979 *28 oct. 20086 mai 2010Concert Technology CorporationSystem and method for correlating similar playlists in a media sharing network
US20100220622 *27 févr. 20102 sept. 2010Yottaa IncAdaptive network with automatic scaling
US20100223364 *25 févr. 20102 sept. 2010Yottaa IncSystem and method for network traffic management and load balancing
US20100223378 *27 févr. 20102 sept. 2010Yottaa IncSystem and method for computer cloud management
US20100228819 *4 mars 20109 sept. 2010Yottaa IncSystem and method for performance acceleration, data protection, disaster recovery and on-demand scaling of computer applications
US20100251329 *24 mars 201030 sept. 2010Yottaa, IncSystem and method for access management and security protection for network accessible computer services
US20100306780 *10 août 20102 déc. 2010Fujitsu LimitedJob assigning apparatus, and control program and control method for job assigning apparatus
US20110215893 *4 mars 20108 sept. 2011Michael NussbaumPlanar audio amplifier output inductor with current sense
US20140101306 *10 oct. 201210 avr. 2014Marco MurgiaSystems and methods for dynamic adaptation of network accelerators
US20140365643 *6 mai 201411 déc. 2014Palo Alto Networks, Inc.Server resource management, analysis, and intrusion negotiation
US20150095499 *20 avr. 20122 avr. 2015Telefonaktiebolaget L M Ericsson (Publ)Method, Device, Network Entity and Computer Program Product for Providing an IP Service Application
US20150095513 *8 déc. 20142 avr. 2015Cisco Technology, Inc.Priority based anycast routing
US20150341448 *4 août 201526 nov. 2015Huawei Technologies Co., Ltd.Method, system, service selection entity, and service management entity for selectingservice provision entity
Classifications
Classification aux États-Unis718/105, 718/104, 709/223, 709/226
Classification internationaleH04L29/06, G06F9/46, H04L29/08
Classification coopérativeH04L67/1031, H04L67/1012, H04L67/1008, H04L67/42, H04L67/02, H04L67/1002, G06F9/505, H04L67/1029
Classification européenneH04L29/08N9A9, H04L29/08N9A1B, H04L29/08N9A
Événements juridiques
DateCodeÉvénementDescription
16 sept. 2002ASAssignment
Owner name: GENUITY INC., MASSACHUSETTS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ABORN, JUSTIN A.;REEL/FRAME:013286/0849
Effective date: 20020905
29 juil. 2003ASAssignment
Owner name: LEVEL 3 COMMUNICATIONS, LLC, COLORADO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GENUITY, INC.;REEL/FRAME:014324/0285
Effective date: 20030204
21 mai 2004ASAssignment
Owner name: LEVEL 3 COMMUNICATIONS, INC., COLORADO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LEVEL 3 COMMUNICATIONS, LLC;REEL/FRAME:014653/0859
Effective date: 20040520
6 sept. 2006ASAssignment
Owner name: MERRILL LYNCH CAPITAL CORPORATION, AS COLLATERAL A
Free format text: SECURITY AGREEMENT;ASSIGNORS:LEVEL 3 COMMUNICATIONS, INC.;ICG COMMUNICATIONS, INC.;REEL/FRAME:018207/0120
Effective date: 20060627
12 mars 2007ASAssignment
Owner name: LEVEL 3 COMMUNICATIONS, LLC, COLORADO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LEVEL 3 COMMUNICATIONS, INC.;REEL/FRAME:018989/0678
Effective date: 20070312
Owner name: LEVEL 3 COMMUNICATIONS, LLC,COLORADO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LEVEL 3 COMMUNICATIONS, INC.;REEL/FRAME:018989/0678
Effective date: 20070312
9 sept. 2008CCCertificate of correction
19 sept. 2011FPAYFee payment
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28 oct. 2015FPAYFee payment
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